Diaphone
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3-2-115
equipment producing a characteristic sound using a reciprocating piston with vents operated by compressed air. Output can be in the form of two tones at different sound levels, the second tone being at a lower frequency. If there is only one tone, it ends in a suddenly lowered pitch known as a “grunt”.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
